Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 49 Issue 23

1 December 2011

Volume 49, Issue 23

Pages i–ii, 1629–1694

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. You have free access to this content
      Cover Image, Volume 49, Issue 23 (pages i–ii)

      Article first published online: 17 OCT 2011 | DOI: 10.1002/polb.22392

      Thumbnail image of graphical abstract

      It is desirable to have a sensor that has both high sensitivity and a tunable detection range for environmental or biological pH sensing applications. However, most sensors are almost fixed in terms of detection range by design and manufacturing, and their sensitivity is compromised by detection range. Existing solutions must rely on integrating multiple sensing elements with each element dedicated to a specific detection range and sensitivity, or using complex micro-electro-mechanical systems to tune sensor structures and/or bias conditions. Liang Dong and colleagues present a new transmissive diffraction grating pH sensor that provides inherently multiple detection range options and high sensitivity on page 1645. The cover shows the grating sensor where each transmitted diffraction order serves a detection channel dedicated to a specific pH range.

  2. Reviews

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
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      Application of free-volume theory to self diffusion of solvents in polymers below the glass transition temperature: A review (pages 1629–1644)

      N. Ramesh, P. K. Davis, J. M. Zielinski, R. P. Danner and J. L. Duda

      Article first published online: 28 SEP 2011 | DOI: 10.1002/polb.22366

      Thumbnail image of graphical abstract

      Free-volume models are frequently used to correlate and predict the self and mutual-diffusion coefficients of low molecular weight solvents in rubbery and glassy polymer systems. Special considerations are necessary for diffusion in polymers below their glass transition temperature. The capability of free-volume theory to describe this case is reviewed in this article. The models can correlate/predict temperature and concentration dependencies of the solvent diffusion coefficients over wide ranges of temperature and concentration.

  3. Communications

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. Multichannel detection using transmissive diffraction grating sensor (pages 1645–1650)

      Depeng Mao, Peng Liu and Liang Dong

      Article first published online: 26 SEP 2011 | DOI: 10.1002/polb.22365

      Thumbnail image of graphical abstract

      For environmental or biological pH sensing, it is desirable to have a sensor that has both high sensitivity and a tunable detection range. A transmissive diffraction grating-based pH sensor is demonstrated to provide inherent multiple detection range options. Each transmitted diffraction order of the grating serves a detection channel dedicated to a specific pH range. The higher the diffraction order, the lower the detection range and the higher the sensitivity. A variety of other sensors (e.g., glucose sensors, antigen-antibody sensors) with tunable dynamic ranges could be realized by incorporating specific hydrogels into this detection scheme.

  4. Full Papers

    1. Top of page
    2. Cover Image
    3. Reviews
    4. Communications
    5. Full Papers
    1. Aggregation behavior of amphiphilic random copolymer of 2-(acrylamido)-2-methylpropanesulfonic acid and tris(trimethylsiloxy)silylpropylmethacrylate in aqueous solution (pages 1651–1659)

      Yoichi Ogata, Munetaka Iwano, Takeshi Mogi and Yutaka Makita

      Article first published online: 8 SEP 2011 | DOI: 10.1002/polb.22354

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      The amphiphilic copolymer of 2-(acrylamido)-2-methylpropanesulfonic acid and tris(trimethylsiloxy)silylpropylmethacrylate (AMPS/TRIS copolymer) has shown excellent performance as an electrode binder in proton exchange membrane fuel cells. This behavior is explained by examining the solution properties of AMPS/TRIS copolymer. Experiments show that in water the AMPS/TRIS copolymer forms unique micelles with less-dense TRIS cores and hard AMPS shells. The findings could lead to further improvements in the performance of the electrode binder, or the development of other polymers for the purpose.

    2. Microstructure evolution during tensile loading histories of a polyurea (pages 1660–1671)

      R. G. Rinaldi, M. C. Boyce, S. J. Weigand, D. J. Londono and M. W. Guise

      Article first published online: 22 SEP 2011 | DOI: 10.1002/polb.22352

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      The evolution of soft- and hard-domain microstructures of elastomeric-like polyurea during different tensile loading histories is key to understanding the stress–strain behavior of the material, in particular, by focusing on dissipation and softening mechanisms. In situ X-ray scattering techniques combined with mechanical properties measurements allow such mesophase evolution to be monitored and related to the mechanical macroscopic performance of polyureas.

    3. Transformation of isotactic polypropylene droplets from the mesophase into the α-phase (pages 1672–1682)

      Deepak S. Langhe, Anne Hiltner and Eric Baer

      Article first published online: 8 SEP 2011 | DOI: 10.1002/polb.22357

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      Isotactic polypropylene (PP) is known to exhibit various crystal phases depending on crystallization conditions such as cooling and heating rates, pressure, and nucleating agents. Through slow cooling of PP droplets, the structural transformation of a heterogeneity-free mesomorphic phase into a monoclinic α-phase is investigated. This study, which shows direct visualization of the transition, is evidence of a control mechanism for nucleation and morphology of PP, a polymer whose toughness and flexibility makes it valuable in a wide range of applications, including packaging and textiles.

    4. Thermoplastic polyurethane/silica nanocomposite fibers by electrospinning (pages 1683–1689)

      Xu-Cheng Zhang, Yi-Zhang Chen, Jian Yu and Zhao-Xia Guo

      Article first published online: 12 SEP 2011 | DOI: 10.1002/polb.22359

      Thumbnail image of graphical abstract

      Thermoplastic polyurethane/silica nanocomposite fibers having good mechanical properties can be prepared by electrospinning so that the silica nanoparticles are uniformly distributed on the fiber surfaces. The resulting composite fiber mats are easily functionalized, for example with gold, suggesting a potential use as functional fibers in a variety of applications.

    5. Fluorescence enhancement of cationic diacetylene-contained polyelectrolyte by anions and cations and application for sensitive and selective detection of Hg2+ (pages 1690–1694)

      Wennan Zeng, Lingyun Wang, Shuimu Lin, Shouping Liu, Roger Beuerman and Derong Cao

      Article first published online: 26 SEP 2011 | DOI: 10.1002/polb.22362

      Thumbnail image of graphical abstract

      Sensors that can detect mercury ions in water usually suffer the presence of other ions in the solution, which can cause quenching of their fluorescence emission and thus hinder the measurement. This limitation can be overcome by cationic conjugated fluorene-co-carbazole-co-diacetylene polymers (CPFC) that present enhanced fluorescence by both anionic and cationic ions. Based on this system of a selective and sensitive fluorescent sensor for detection of Hg2+ is presented in this article.

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